Which statement best describes the effect of a larger slant angle on skin?

Which statement best describes the effect of a larger slant angle on skin?

• A. Contributes more negatively to total skin
• B. Contributes more positively to total skin
• C. No effect
• D. Always improves production

Answer: (A)

Increasing the slant angle tests how wellbore orientation affects near-well damage, captured by the skin factor. When the well is more inclined, the flow path near the well becomes longer and the formation is more exposed to the flow. This tends to boost friction, turbulence, and drilling-related damage (such as mud invasion or fines settling), which raises the pressure drop in the near-well region. That means the skin factor becomes more adverse, contributing to a larger, more negative impact on production. So the statement that a larger slant angle contributes more negatively to the total skin best describes the effect.

Increasing the slant angle tests how wellbore orientation affects near-well damage, captured by the skin factor. When the well is more inclined, the flow path near the well becomes longer and the formation is more exposed to the flow. This tends to boost friction, turbulence, and drilling-related damage (such as mud invasion or fines settling), which raises the pressure drop in the near-well region. That means the skin factor becomes more adverse, contributing to a larger, more negative impact on production. So the statement that a larger slant angle contributes more negatively to the total skin best describes the effect.